// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/compositor/float_animation_curve_adapter.h"

#include "cc/base/time_util.h"

namespace ui {

FloatAnimationCurveAdapter::FloatAnimationCurveAdapter(
    gfx::Tween::Type tween_type,
    float initial_value,
    float target_value,
    base::TimeDelta duration)
    : tween_type_(tween_type)
    , initial_value_(initial_value)
    , target_value_(target_value)
    , duration_(duration)
{
}

base::TimeDelta FloatAnimationCurveAdapter::Duration() const
{
    return duration_;
}

scoped_ptr<cc::AnimationCurve> FloatAnimationCurveAdapter::Clone() const
{
    return make_scoped_ptr(new FloatAnimationCurveAdapter(
        tween_type_, initial_value_, target_value_, duration_));
}

float FloatAnimationCurveAdapter::GetValue(base::TimeDelta t) const
{
    if (t >= duration_)
        return target_value_;
    if (t <= base::TimeDelta())
        return initial_value_;
    double progress = cc::TimeUtil::Divide(t, duration_);
    return gfx::Tween::FloatValueBetween(
        gfx::Tween::CalculateValue(tween_type_, progress),
        initial_value_,
        target_value_);
}

} // namespace ui
